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avfilter/showvolume : add persistent max display

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draw a color line for the max level in the given duration
This commit is contained in:
Martin Vignali 2018-04-16 11:32:48 +02:00
parent cb2f52b6a7
commit fd10a6e2f2
2 changed files with 62 additions and 0 deletions
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10
doc/filters.texi
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@ -20018,6 +20018,16 @@ default is @code{p}.
@item ds
Set display scale, can be linear: @code{lin} or log: @code{log},
default is @code{lin}.
@item dm
In second.
If set to > 0., display a line for the max level
in the previous seconds.
default is disabled: @code{0.}
@item dmc
The color of the max line. Use when @code{dm} option is set to > 0.
default is: @code{orange}
@end table
@section showwaves

52
libavfilter/avf_showvolume.c
View File

@ -57,6 +57,12 @@ typedef struct ShowVolumeContext {
float rms_factor;
int display_scale;
double draw_persistent_duration; /* in second */
uint8_t persistant_max_rgba[4];
int persistent_max_frames; /* number of frames to check max value */
float *max_persistent; /* max value for draw_persistent_max for each channel */
int *nb_frames_max_display; /* number of frame for each channel, for displaying the max value */
void (*meter)(float *src, int nb_samples, float *max, float factor);
} ShowVolumeContext;
@ -73,6 +79,8 @@ static const AVOption showvolume_options[] = {
{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256+0xff000000"}, 0, 0, FLAGS },
{ "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "dm", "duration for max value display", OFFSET(draw_persistent_duration), AV_OPT_TYPE_DOUBLE, {.dbl=0.}, 0, 9000, FLAGS},
{ "dmc","set color of the max value line", OFFSET(persistant_max_rgba), AV_OPT_TYPE_COLOR, {.str = "orange"}, CHAR_MIN, CHAR_MAX, FLAGS },
{ "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
{ "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
{ "v", "vertical", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "orientation" },
@ -180,6 +188,11 @@ static int config_input(AVFilterLink *inlink)
default: return AVERROR_BUG;
}
if (s->draw_persistent_duration > 0.) {
s->persistent_max_frames = (int) FFMAX(av_q2d(s->frame_rate) * s->draw_persistent_duration, 1.);
s->max_persistent = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->max_persistent));
s->nb_frames_max_display = av_calloc(inlink->channels * s->persistent_max_frames, sizeof(*s->nb_frames_max_display));
}
return 0;
}
@ -276,6 +289,33 @@ static inline int calc_max_draw(ShowVolumeContext *s, AVFilterLink *outlink, flo
}
}
static inline void calc_persistent_max(ShowVolumeContext *s, float max, int channel)
{
/* update max value for persistent max display */
if ((max >= s->max_persistent[channel]) || (s->nb_frames_max_display[channel] >= s->persistent_max_frames)) { /* update max value for display */
s->max_persistent[channel] = max;
s->nb_frames_max_display[channel] = 0;
} else {
s->nb_frames_max_display[channel] += 1; /* incremente display frame count */
}
}
static inline void draw_max_line(ShowVolumeContext *s, int max_draw, int channel)
{
int k;
if (s->orientation) { /* vertical */
uint8_t *dst = s->out->data[0] + max_draw * s->out->linesize[0] + channel * (s->b + s->h) * 4;
for (k = 0; k < s->h; k++) {
memcpy(dst + k * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
}
} else { /* horizontal */
for (k = 0; k < s->h; k++) {
uint8_t *dst = s->out->data[0] + (channel * s->h + channel * s->b + k) * s->out->linesize[0];
memcpy(dst + max_draw * 4, s->persistant_max_rgba, sizeof(s->persistant_max_rgba));
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
@ -341,6 +381,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
continue;
drawtext(s->out, c * (s->h + s->b) + (s->h - 10) / 2, outlink->h - 35, channel_name, 1);
}
if (s->draw_persistent_duration > 0.) {
calc_persistent_max(s, max, c);
max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
draw_max_line(s, max_draw, c);
}
}
} else { /* horizontal */
for (c = 0; c < inlink->channels; c++) {
@ -371,6 +417,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
continue;
drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2, channel_name, 0);
}
if (s->draw_persistent_duration > 0.) {
calc_persistent_max(s, max, c);
max_draw = FFMAX(0, calc_max_draw(s, outlink, s->max_persistent[c]) - 1);
draw_max_line(s, max_draw, c);
}
}
}